On Fri, Apr 13, 2012 at 2:18 PM, Stefan Behnel <stefan...@behnel.de> wrote:
> wlavrij...@lbl.gov, 13.04.2012 19:03: > >> Note that a wrapper function may offer more than one native signature, > e.g. > >> when wrapping overloaded C++ functions or when using Cython fused > functions. > > > > the big problem I'm finding for unpacking C++ functions (other than that > > there's no platform-independent way to do so when it comes to methods, > AFAIK > > anyway), is handling of C++ exceptions. > > At least for Cython code that's not a problem - its functions raise Python > exceptions. Some C++ exceptions are mapped automatically and others can be > mapped explicitly. > > Other wrapper generators could also generate an intermediate wrapper > function that does the error mapping and passes on Python exceptions. > Unpacking a wrapped function doesn't necessarily mean that you get a bare C > or C++ function. The main intention is to reduce the call overhead, which > is mainly introduced by packing and unpacking arguments. That's why we want > to expose the signature. > > > > Integrating unpacked functions pointers with PyPy works rather elegantly > > through the functionality made available in rlib/libffi.py. The form of > the > > specification matters little at that point, as long as it is complete. > > Hmm, but that's RPython, isn't it? I thought that was compiled statically? > How would it adapt to a signature that it finds at runtime then? > > I think this is closer to ctypes, except that you don't have to specify the > signature of the thing you call because PyPy will see it at call time. > > > > For cppyy, the current plan is to wrap python functions in generated C++ > > functions for callbacks. > > Yes, that would be the other direction. > > Stefan > > _______________________________________________ > pypy-dev mailing list > pypy-dev@python.org > http://mail.python.org/mailman/listinfo/pypy-dev > rlib/libffi.py is for runtime stuff, it's the basis of both ctypes and the C++ wrapper. You may be thinking of rffi.py, which is compile time. Alex -- "I disapprove of what you say, but I will defend to the death your right to say it." -- Evelyn Beatrice Hall (summarizing Voltaire) "The people's good is the highest law." -- Cicero
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